doc.: IEEE 802.11-15/0815r0 Submission July 2015 Intel
CorporationSlide 1 mmWave Small Cell Reconfigurable Backhauling
with Steerable Lens-Array Antennas (LAA) Date: 2015-07-12
Authors:
Slide 2
doc.: IEEE 802.11-15/0815r0 Submission July 2015 Intel
CorporationSlide 2 Abstract The IEEE 802.11ay group proposed the
wireless backhauling as one of the eight use cases for future
mmWave systems, [1]. In that scenario 11ay Access Points (APs) are
interconnected into the network exploiting a point-to-point or
point-to-multi point wireless backhauling topologies. It is
proposed to be used as a replacement of the legacy core fiber
networks to provide small cell connectivity. This presentation
proposes a solution for the antenna technology named as Lens-Array
Antenna (LAA). It provides high gain transmission, sector sweep
beamforming capabilities, and implementation using cost efficient
CMOS technology suitable for massive market production. In this
work the results of experimental measurements for the considered
LAA design are provided. It includes radiation pattern
measurements, beamforming sector sweep capabilities verification,
feasibility study of backhaul point-to-point transmission using LAA
and IEEE 802.11ad PHY protocol, and channel measurement
results.
Slide 3
doc.: IEEE 802.11-15/0815r0 Submission Phased Antenna Array
(PAA) Figures on the left show Phased Antenna Array (PAA) and
associated system of coordinates. Main parameters: 8 x 2 active
elements rectangular geometry 25 mm x 9 mm geometrical size
Vertical polarization, E field vector is parallel to the short edge
of the array Total transmit power P TX = 10 dBm Antenna gain G ant
= 15 dBi July 2015 Intel CorporationSlide 3
Slide 4
doc.: IEEE 802.11-15/0815r0 Submission Toroidal Dielectric Lens
July 2015 Intel CorporationSlide 4 ParameterValue Material
properties MaterialPolyethylene Dielectric permittivity, 2.3
Geometry truncated ellipse (elevation plane) Aperture, D112.3 mm
Radius, f123.0 mm Focal length, c48.7 mm Semi-major axis, a74.3 mm
Lens geometry in elevation plane Toroidal dielectric lens
parameters 3D lens geometry
Slide 5
doc.: IEEE 802.11-15/0815r0 Submission Lens-Array Antenna (LAA)
Lens-Array Antenna (LAA) solution integrates PAA and dielectric
lens in the entire antenna system as shown in figure below. The PAA
is mounted at the back side of the lens in such a way that its
geometrical center is collocated with the focus point of the lens
and aperture D is parallel to the Z axis of the system of
coordinate associated with PAA. July 2015 Intel CorporationSlide
5
doc.: IEEE 802.11-15/0815r0 Submission Summary of Main
Parameters July 2015 Intel CorporationSlide 7 ParameterValue PAA
(can be positioned in space) Aperture (vertical by horizontal
size)9 mm x 25 mm Half Power Beam Width (HPBW) for azimuth and
elevation To be estimated Radio Frequency (RF) channel #2F c =
60.48 GHz F = 2.16 GHz Positioning system Elevation angle step
(manual setup) / range1 0 / {-60 0,60 0 } Azimuth angle step (using
rotation machine HD-2002U CT-308) / range 0.416 0 / {-90 0,90 0 }
Angular speed = 0.4162 deg/ ParameterValue Receiver antenna (has
fixed position) Aperture (diameter)100 mm Gain34.5 dBi HPBW for
azimuth and elevation HPBW = HPBW = 3 0 Agilent Technologies ESA-E
Series Spectrum Analyzer (E4407B) Start frequency59.4 GHz Stop
frequency61.56 GHz Channel power band2.16 GHz Sweep time26 ms
Resolution Band Width (RBW) 3 MHz Video Band Width (VBW)3 MHz
Tables below provide a summary of the main parameters of the
considered experimental setup. Transmitter parametersReceiver
parameters
Slide 8
doc.: IEEE 802.11-15/0815r0 Submission Measured PAA Radiation
Pattern Half Power Beam Width (HPBW): In azimuth: 14.0 0 In
elevation: 41.0 0 July 2015 Intel CorporationSlide 8
Slide 9
doc.: IEEE 802.11-15/0815r0 Submission Measured LAA Radiation
Pattern July 2015 Intel CorporationSlide 9 HPBW: In azimuth: 9.0 0
In elevation: 3.0 0 Maximum lens gain: G lens = 12.0 dB
doc.: IEEE 802.11-15/0815r0 Submission Backhaul Street Level
Measurement Setup July 2015 Intel CorporationSlide 11
Slide 12
doc.: IEEE 802.11-15/0815r0 Submission Backhaul Packet
Transmission July 2015 Intel CorporationSlide 12 Receiver
constellation scattering diagrams for WiGig/11ad Single Carrier
(SC) PHY 16QAM constellation: d = 100 m d = 150 m d = 200 m
Receiver Error Vector Magnitude (EVM) characteristic degrades from
-17.7 dB to -12.0 dB with increasing of the distance between
transmitter and receiver from 100 to 200 meters accordingly.
However even for 200 meters it allows encoded transmission with
very low Packet Error Rate (PER ~0) for the data rate 4.62 Gbps
using implemented IEEE 802.11ad PHY air protocol.
Slide 13
doc.: IEEE 802.11-15/0815r0 Submission Backhaul Channel
Measurements Figures below show measured Channel Impulse Responses
(CIRs) for different distances between transmitter and receiver,
equal to 100 m, 150 m, and 200 m accordingly. The transmitter and
receiver LAA antennas are placed at the height of ~1.7 m above the
ground level. Sampling is done @ 2.64 GHz sample rate. The time for
CIR peak is assigned to zero value. All CIRs are normalized to unit
power. July 2015 Intel CorporationSlide 13 d = 100 m d = 150 m d =
200 m
Slide 14
doc.: IEEE 802.11-15/0815r0 Submission Conclusions In this work
Lens-Array Antenna (LAA) technology is proposed to be used for
future mmWave wireless backhaul application. The experimental
measurements presented in this work show that dielectric lens
provides in total 24.0 dB (12.0 dB + 12.0 dB) additional gain for
transmitter and receiver. The feasibility study of the packet
transmission in point-to-point link configuration show that the
current IEEE 802.11ad SC PHY protocol can be used to achieve 200
meters in single hop topology with maximum data rate equal to 4.62
Gbps. The LAA design allows sector sweep beamforming capabilities
in the 45.0 0 azimuthal sector and can be used for adaptive routing
and point- to-multi point data transmission. 4 LLA units guarantee
full 360 0 space coverage in azimuth plane. July 2015 Intel
CorporationSlide 14
Slide 15
doc.: IEEE 802.11-15/0815r0 Submission July 2015 Intel
CorporationSlide 15 References 1.R. Sun, IEEE 802.11 TGay Use
Cases, IEEE doc. 11-15/0625r2.